Method of preparing tobermorite from fly ash and application thereof

A tobermorite and fly ash technology, applied in the directions of alkaline earth metal silicate, silicate, etc., can solve problems such as environmental pollution, and achieve better mass transfer effect, better mass transfer effect and low energy consumption. Effect
CN104828834AActive Publication Date: 2015-08-12INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2015-08-12

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Abstract

The invention belongs to the field of recycle of solid wastes, and particularly, relates to a method of preparing tobermorite from fly ash and an application thereof. The method comprises following steps: (1) material preparation: mixing the fly ash and a calcium raw material with a molar ratio of CaO to SiO2 being 0.4-1.4 to prepare a mixed material, and dissolving the mixed material in an alkaline solution according to the ratio of 1:10-1:40 to obtain a mixed slurry material; (2) reaction: performing a synthetic reaction in a sealed container to the mixed slurry material at 100-250 DEG C for 3-30 h, and filtering a reaction product to obtain tobermorite wet residue. A press-moulded product of the tobermorite is low in volume weight and is excellent in performance. Compared with a conventional method in which the tobermorite is synthesized through an autoclaved curing process with a silicon raw material and a calcium raw material, the method is better in mass transfer of the reaction process so that the method is lower in energy consumption.
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Description

technical field

[0001] The invention belongs to the field of solid waste reuse, in particular, the invention relates to a method for preparing tobermolite from fly ash and its application. Background technique

[0002] According to public information reports, every ton of coal burned can produce 250-300kg of fly ash. Since the founding of the People's Republic of China, the total amount of fly ash that has not been utilized and has been piled up in ash yards has exceeded 2.5 billion tons. It is estimated that my country's fly ash emissions will increase from 480 million tons in 2010 to 580 million tons in 2015. Ton. Usually fly ash is processed by making bricks, building roads, producing cement, and improving soil. However, these utilization methods cannot completely absorb the huge amount of fly ash in our country, thus causing a large amount of fly ash to accumulate and causing great pressure on the environment.

[0003] However, tobermullite is a kind of hydrated calciu...

Claims

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